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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Short-Term Borrowings Outstanding	$ 64.0	$ 64.1	$ 37.3
Revolving Credit Facility
Debt Instrument [Line Items]
Revolving credit facility, limit	120.0	120.0	120.0
Short-Term Borrowings Outstanding	64.0	64.1	37.3
Available revolving credit facility	$ 56.0	$ 55.9	$ 82.7

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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